Filippo Speranza

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Among the key topics of discussion and research on three-dimensional television (3D-TV), visual comfort is certainly one of the most critical. This is because it is well known that some viewers experience visual discomfort when looking at stereoscopic displays. It is important to properly address the issue of visual comfort to avoid possible delays in the(More)
The purpose of this study is to propose a quality metric of video encoded with variable frame rates and quantization parameters suitable for mobile video broadcasting applications. As a first step, experiments are conducted to assess the subjective quality of video sequences encoded with variable frame rates and quantization parameters. Resulting(More)
With the constant evolution of video technology and the deployment of new video services, content providers and broadcasters always face the challenge of delivering an adequate video quality which meets end-users expectations. The development of reliable quality testing and quality monitoring tools that can be used by broadcasters ultimately requires(More)
As a practical and novel application of watermarking, this paper presents a digital watermarking-based image quality evaluation method that can accurately estimate image quality in terms of the classical objective metrics, such as peak signal-to-noise ratio (PSNR), weighted PSNR (wPSNR), and Watson just noticeable difference (JND), without the need for the(More)
For industry, the need to access accurate and reliable objective video metrics has become more pressing with the advent of new video applications and services such as mobile broadcasting, Internet video, and Internet Protocol television (IPTV). Industry-class objective quality- measurement models have a wide range of uses, including equipment testing (e.g.,(More)
For the purpose of temporally scalable video coding and multi-dimensional bit rate control, we conducted experiments of subjective quality assessment for video sequences encoding with variable frame rates and quantization parameters. The experimental results show that the correlation between the PSNR and the subjective quality becomes very low when the two(More)
This work presents an objective MPEG-2 video quality measurement method based on fragile digital image watermarking. Based on the DCT-based watermarking scheme, this paper presents a fragile digital video watermarking scheme that can work as an automatic quality monitoring system. We embed watermark in the DCT domain of I-frames of original video, and the(More)
This paper proposes a new disparity remapping framework to improve the visual comfort of stereoscopic images. The proposed framework adaptively remaps disparities of a scene according to different causes of visual discomfort. A linear disparity remapping is first performed in order to address visual discomfort induced by excessive disparities. This linear(More)
The aim of the present pilot study was to compare the efficacy and safety of trimethoprim (TMP) and sulfamethoxazole (SMX) with those of the standard therapy pyrimethamine (P)-sulfadiazine (S) for the treatment of toxoplasmic encephalitis in patients with AIDS. This was a pilot, multicenter, randomized, and prospective study. Patients were randomly assigned(More)
Nitric oxide (NO) is an important biologically active molecule that plays a key part in host defence against bacteria, protozoa, and tumour cells. NO has antiviral effects against several DNA viruses, such as murine poxvirus, herpes simplex virus, and Epstein-Barr virus, and some RNA viruses, such as coxsackievirus. In several studies, in vitro and in vivo,(More)